diff --git a/h5p.classes.php b/h5p.classes.php
index b0ad889..e04a0e9 100644
--- a/h5p.classes.php
+++ b/h5p.classes.php
@@ -1589,15 +1589,11 @@ Class H5PExport {
     $zip = new ZipArchive();
     $zip->open($tmpFile, ZipArchive::CREATE | ZipArchive::OVERWRITE);
 
-    // Some system needs the root prefix for ZipArchive's addFile()
-    $rootPrefix = (empty($_SERVER['DOCUMENT_ROOT']) ? '' : $_SERVER['DOCUMENT_ROOT'] . '/');
-
     // Add all the files from the tmp dir.
     foreach ($files as $file) {
       // Please note that the zip format has no concept of folders, we must
       // use forward slashes to separate our directories.
-      $zip->addFile($file->absolutePath, $file->relativePath);
-      $zip->addFile($rootPrefix . $file->absolutePath, $file->relativePath);
+      $zip->addFile(realpath($file->absolutePath), $file->relativePath);
     }
 
     // Close zip and remove tmp dir